seavert



E. W. SEAVERT.

sAwnu-ST BURNER.

APPLICATION FILED SEPT. I9, 1917. 1,359,926.

RENEWED AUG. 25| i920.

Patented Nov. 23, 1920,..

www cj'aae provide a due which may bedisposed wit-lt. in the stove to renner the same capable of I 'usingsawdust as fuel vin an eflvicient, reliable f assenze.

narrany srarssffeaFreni?` orties;

EDWARD w. snavnn'i, on oAilrAsfWAsiiInGToN.

snwnusT-nunivna A Specification of Letters Patent. Patented NQV. 23, 19.20.15

Application filed September v19, 1917, Serial No. 192,100. RenewedvAugust 25, 1920. Serial No. 406,l)`07.

fo all 'whom t 'may concern j Bc it known that' l, En nino TW; Sniivnn'r, a' citizen ofv the VUnited vStates, residing at Camas, in the county of- Clarkeand State of llVasliington, have invented new and useful improvements in Sawdust-Burners, of which the followingl a specificati n This invention relates'to a sawdust burner designed foi use in coal burning stoves of the heating tj )e commonly employing coal as fuel,4 the obiect of the invention being to and economical manner. b

A further object of Vthe invention is provide a flue which may be arranged withinthe stove in such a manneras to carry oif the gases generated from the combustion of the fuel within the fire pot, thereby. eliminat-V Y ingy all liabilityof an explosion, while permit-ting of a large amount of sawdustto be banked or stored within the ,stove for gravi-D tative feed to the grate within the combustion chamber. v C

The invention consists ofV theaeatures vof. construction, combination and arrangement f of parts,- Vhereinaifter fully described an-:LL l --clanned, referencebemg had to the accom-v.

panying Adrawing, in which Figure l is a verticalfrontto rear section through a heating stove showing the applicationof therinvention.

Fig. 2 is a 1eers ective view of the O'as flue b l en `removed from the stove.`

Referring to the drawing, l designates a heating stove of the type commonly employ- `nre box or pot 2, an ash pit 3, a grate d arranged at the base of the fire box and top of the ash pit, a feed door 5 for the introduction of the fuel, a combustion chamber 6,v

and an outlet 7 Vfor the discharge of the products ofcombustion. l

In carrying my invention into practice, l provide a flue 8, m de of metal or any other suitable material, said flue being arranged in an inclined position within the fire box and chamber 6 of the stove. As shown, the flue S v is of conical form or tapers longitudinally,

uniformly from bottom to top throughout its length.

The base or enlarged end of the Vflue ,8 rests upon the grate l at a point about centrally l of the grate, and the tube thence extends upwardly and rearwardly through the fire .box

toa point adjacent to the top of the chamber Y 6, and has itsy upper or reducedend arranged to rest against the rear wall of the stove body approximately' 1n verticalV alinement with the smoke outlet "7. ln practice, the 1 The flue 8 is imperforate throughout with the exception tha'tvthe rear half or. portion of thelower end of said yiiue is cut away `oblique on a curvedlme, asshown at 9, forming a rear` inlet openingfor the-passage into said tube` of the Vgases generated from the combustion of the fuel withintlie lire box, l

said'opening being substantially of the same depth as the fire box. :i lny they use of the tube the vfire box` and chamber 6 are filled with a charge l0 of sawdust upto a level just short of thek top of the tube andthe base of the?` door 5, the maximum level'of the fuel being'- such as to prevent any of the fuel from entering the'upper end of tlieflue and permit i of the free dischargeof thegases from the upper end lof the fluefor final discharge@ ythrough, the outlet 'Y'. ln burning the fuel v with the use of the gas discharge flue, ,the

lower portion of the `body of fuel or that f portion containedrwithin the lire box 2, is

ignited and lasthis'portion of the fuel is"l` ,y y

graduallyfconsumed and the residue drops into the ash pit 3 the sawdust contained within the chamber 6 v feedslfdownward v by gravity to take the place'of the'fuel vrconsumed, an'dvthis operation continues aslongas the stove is kept in actionor until the entire body of'fuel is consumed, it bei-ng uny derstood'thatthe supply of fuel may be replenished'frorn ftime'to time'a's desired tovr maintain amaximuin level, should it be de sired to keep the stovein constant operation'. In the combustion of the :fuel contained within the fire box gases are generated,- and as these "gases cannot escape with suflieient freedomV through the body of fuel above provision. must be made for their escape in or- Vder yto avoidan explosion.l This'danger of .explosion'is also increased in the event of -the presence of any moisture in the fuel, re,` sulting in the production of steam. Bytlie use of the iiue 8 apassage is provided for' the upflow vof the gases and steam, if any, generated from the fire box in the *upper portion of the stove` above the body of fuel, for discharge through the outlet 7, the gases passing into the fluethrough thecut away portion or incline as wili be readily "under- .stood By the use of a conical or daring flue the upflow and discharge of the gases and steam is facilitated, with the result that all liability of the danger of explosion is obviated, while at the same time sinfiicientV ventilation is vaffo'rdedvto insure free'burning and proper combustion of the fuel, without liability of too rapid combustion, economyl inthe use of fuel thus being obtainec y It willbe observed from 'theforegoing description that .as the flue is imperforate except at itslower end, which is cut away to form an inlet of a depth substantially equal to that of the fire-pot, combustion of the fuel will be allowedto take place only within the fire-pot at the base of the body offuel, that portion of the fuel resting upon theV grate being only consumed, and the remainder of the fuel feeding down gradul ally to take the place of the fuel consumed,

the residue from which flows through the grate into the ashpit. As the discharge end lof the flue is located in lproximity toV and substantially in alinementJ with the smoke `outlet' 7, it will also be .evident that a beneficial draft will be created through the tube, rto facilitate combustion ofthe burning portion of the fuel and the rapid and safe distcharge of gases,rthe depth of the inletopeningV of the tube insuring the entering' into thetube of all gases generated in the combustion zone, and thus obviatingany dangerous tendency of these gases filtering up Vthrough the vbody of the fuel. Furthermore,

the gases from the'burning portion of the fuel will be conducted for discharge to a point above the maximum level of the fuel, allowing the burning portion of fuel to colte.y with the result of burning more slowly and throwing off more intense heat, while obviating allv liability of an explosion occurring through ignition of the gases. The deo scribed inclination of the iue and form of.

y the inlet at the bottom thereof effectuallyprevents i such inlet from becoming clogged'or 'choked with the fuel, while, as

1 theflue is otherwise entirely free from perforations,.the entrance of sawdust at any point into the flue and chokingy of the flue will be entirely prevented. In the burning of sawdust with economy and safety, it is essentialto restrict the combustion zone to the base portion of the mass of fuel, and to-,carry off the generated gases, otherwise Y. the'body of fuel at a higher elevation is liable tobe ignited from the hot gases, with,

the result of quickly consuming the whole body of fuel and causing dangerous overheating of the stove; or the admission of hot gases into the body of the fuel above its base is liable to cause the liberation of steam or generation of an excess quantity of'gas, with the consequent danger of explosion. By the provision of my improved construction of flue, all these objections and dangers are obviated in a simple and effective man- 7V() ner, its Luse allowing ksawdust to bev effec-L tively burned as fuel in a safe and economi- Y cal way.v Y

By the use of my improved gas flue, which 'may be applied-to any ordinary form of In a sawdust burner for heating stoves,

" the combination with a heating stove having a fire-prot, an ash-pit, a grate between the fire-pot and ash-pit, and a fuel chamber 4above the fire-pot provided with aV fuel-feed door, said fuel chamber being also provided in its top and'in proximity to its rear wall with. an outlet for the discharge'of the prod-i ncts of combustion, of a flue comprising aA tube arranged to rest at its lower end upon the grate about centrally of the latter andv to extend upwardly and rearwardly' at an angle through the body Vof fuel'in the firepot and fuel chamber with its upper end terminating above the maximum level of the fuel and in proximity to the rear wall of the fuel chamber and substantially in vertical alinement with said products discharge outlet, said tube being Vof maximum diameter at its lower inlet end, of minimum diameter at its u pper'outlet end, and tapering uniformly between such ends., the rear half of the said lower inlet end of the' tube being cut away on a curved line to provide a gas and vapor inlet located wholly at the rear of said tube and of a depth approximately equal to the depth of the fire-pot, the tube being otherwise imperforate and closed against communication with the fuel containing space of the stove throughout its entire length. Y f Y In testimony whereof I afix my signature.

EDWARD WV. SEAVERT. 

